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2003 Impala cooling fans not coming on relays check out temp sensor replaced with an auto zone one and suggestion would help
 

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Check the fuses, if ok then check for good power and ground at the cooling fan wire harness connector at the cooling fan. you can do this by connecting a test light between the cooling fan terminals, start the car and turn on the A/C. When the a/c is turned on the cooling fans are also turned on and the test light should light. If it does you need a new fan. If it doesn't you need to check the wiring for an open somewhere.

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